Do NOT invert the lamp. All you'll do is spill oil on your and the floor. So long as the oil is still liquid, the wick will be wet- roll it up so it is easier to light, light it, roll it down, and put the chimney (the glass part) on it. Don't be surprised if you snuff the wick a few times until you get used to where it should be- try now when you don't need.

And echo the suggestion of putting a mirror under or behind the lamp. Particularly if you have a white ceiling- the light reflecting up will scatter. Not good enough to read or sew by, but you won't be tripping over things.